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  <title>Get the current sid of the process</title>
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  <div id="layout-content"><div id="function.posix-getsid" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">posix_getsid</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">posix_getsid</span> &mdash; <span class="dc-title">Get the current sid of the process</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.posix-getsid-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>posix_getsid</strong></span>(<span class="methodparam"><span class="type">int</span> <code class="parameter">$process_id</code></span>): <span class="type"><span class="type">int</span>|<span class="type"><span class="type false">false</span></span></span></div>

  <p class="para rdfs-comment">
   Return the session id of the process <code class="parameter">process_id</code>.
   The session id of a process is the process group id of the session leader.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.posix-getsid-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">process_id</code></dt>

     <dd>

      <p class="para">
       The process identifier. If set to 0, the current process is
       assumed.  If an invalid <code class="parameter">process_id</code> is
       specified, then <strong><code>false</code></strong> is returned and an error is set which
       can be checked with <span class="function"><a href="function.posix-get-last-error.html" class="function">posix_get_last_error()</a></span>.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.posix-getsid-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns the identifier, as an <span class="type">int</span>,  或者在失败时返回 <strong><code>false</code></strong>.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.posix-getsid-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3297">
    <p><strong>示例 #1 Example use of <span class="function"><strong>posix_getsid()</strong></span></strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$pid&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">posix_getpid</span><span style="color: #007700">();<br />echo&nbsp;</span><span style="color: #0000BB">posix_getsid</span><span style="color: #007700">(</span><span style="color: #0000BB">$pid</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//8805<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.posix-getsid-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member">
     <span class="function"><a href="function.posix-getpgid.html" class="function" rel="rdfs-seeAlso">posix_getpgid()</a> - Get process group id for job control</span>
    </li>
    <li class="member">
     <span class="function"><a href="function.posix-setsid.html" class="function" rel="rdfs-seeAlso">posix_setsid()</a> - Make the current process a session leader</span>
    </li>
    <li class="member">POSIX man page GETSID(2)</li>
   </ul>
  </p>
 </div>



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